This is exactly what I did, and I get the following rejection as a result:
Policy 2.9
Your Extension includes HTML files that are not correctly loading the Twitch Extension Helper. Either it is not present, or it is not being loaded first. Please make sure that the Twitch Extension Helper is included from our CDN and is being loaded before all other Javascript within each HTML file of your upload.
<script src=“https://code.jquery.com/jquery-3.3.1.min.js” integrity=“sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=” crossorigin=“anonymous”>